RAID

Question 1

Which Array provides Striping, where the data is split evenly across the drives but has 0 Redundancy?

Answer 1

Raid 0

Raid 0 is High Performance since data can be written quickly but a drive failure will break the array.

Question 2

Which Array Provides Mirroring between two or more drives?

Answer 2

Raid 1

Raid 1 requires double the storage but is great for high disk utilization and High Redundancy as a single failing disk will not break the array and the other disk will have the same data available.

Question 3

Which Array provides Striping with Parity and requires At least 3 disks?

Answer 3

Raid 5
Raid 5 stripes data between the disks making for efficient disk space and then a 4th drive that stores parity information so any drive failure can be rebuilt using that parity data.

This is great for high redundancy but can cause some performance issues because a failed drive will require time to be rebuilt.

Question 4

Which array provides a stripe of mirrors and requires At least 4 Drives? But can be the most costly?

Answer 4

Raid 10

Raid 10 provides great redundancy and the speed of striping by splitting the data between multiple drives and mirroring it but because you need more drives it can be more costly of an approach.

This takes the striped Array split among multiple drives and mirrors that striped data onto separate array of drives so that if any of the drives in a single array fail the data can be rebuilt from the data in the mirrored array.